Email Verification API

Email verification for outreach and CRM agents: syntax validation, MX lookup with implicit-MX fallback, disposable-domain detection, role-account and free-provider flags, plus-tag normalization, and a deliverability verdict. No signup, no external services.

Parameters

Example request

curl "https://api.webbersites.com/api/email/verify?email=jane.doe%2Bnews%40gmail.com"
# first call returns 402 + payment requirements; an x402 client pays and retries automatically

Example response

{
    "email": "jane.doe+news@gmail.com",
    "normalized": "janedoe@gmail.com",
    "syntax": {
        "valid": true
    },
    "domain_check": {
        "mx_found": true
    },
    "flags": {
        "disposable": false,
        "role_account": false,
        "free_provider": true,
        "plus_tag": true
    },
    "verdict": "deliverable_domain"
}

How payment works

There is no signup and no API key. Call the endpoint; it replies 402 Payment Required with machine-readable payment requirements. Your client signs a USDC transfer authorization (EIP-3009, gasless) and retries with the X-PAYMENT header — @x402/fetch does this automatically. See the overview for a working snippet.